Finding the Fourth Proportional to 8,521.62, 12,777.42 and 3,588.60

Step by Step Solution

1. Step 1: Write the proportion equation
   8,521.62 : 12,777.42 = 3,588.60 : x
2. Step 2: Convert to fraction form
   8,521.62/12,777.42 = 3,588.60/x
3. Step 3: Cross multiply
   8,521.62x = 12,777.42 × 3,588.60
4. Step 4: Simplify right side
   8,521.62x = 45,853,049.41
5. Step 5: Solve for x
   x = 45,853,049.41/8,521.62
6. Step 6: Final answer
   x = 5,380.79